PLATE II. 



Excepting fig. 4o, all the specimens figured on this plate are now in the Illinois 

 State Museum. They were collected by Dr. Oliver Everett from the Trenton limestone. 

 near Dixon, 111. 



PAGE. 



Fig. 1. ANTHASPIDELLA FENESTBATA U. & E 264 



Lateral view of the type specimen, showing the oblique cup, and the 

 arrangement of the oscula and canals. 



Fig. 2. ANTHASPIDELLA GBANDIS U. & E 262 



2. Part of a fragment of a large specimen showing the arrangement of the 



canalf and the widely separated oscula on the upper surface, natural 

 size. 



2 a. A small portion of the lower surface showing the irregular eha acter of 



the canals on this side. Natural size. 



Fig. 3. ANTHASPIDELLA FLRMA U. & E 263 



3. Side view of a specimen, natural size. 



3 a. View of upper surface of same, showing the arrangement of the oscula 



and canals. Natural size. 



Fig. 4. HlNDIA IN.W3UALI8 U. & E 275 



4. Vertical section of large specimen showing the radiate cljimu'U'r uf the 



spicular me-h. Natural size. 



4 a. Transverse section of same, x25, showing the spicules and the unequal 



size of the radiate canals. 

 4 b. Shows the appearance of the skeleton in vertical sections, xiV 



Fig. 4c. HYALOSTELIA SOLIVAGA Ulrich 232 



A large Hexactinellid spicule constantly found associated with Hindia 

 sphceroidalis Duncan, in the Niagara deposits of Kentucky, Tennesse, 

 Indiana and Minnesota. The specimen figured is from the last locality, and 

 belongs to the collection of Mr. E. O. Ulrich. 



